Abstract
An field experiment was carried out to evaluate the synergistic effect of micronutrients alone and in combination on growth and fruit yield in grapes during 2012. Grape cultivar “Flame seedless vines, grown at NARC, Islamabad, were sprayed at bloom and fruit set (just after berry shatter) with Zink @ 0.03%, Manganese @ 0.05%, Ferrous Sulphate @ 0.07%. Boric acid was used as 0.1% as wetting agent. For each treatment, micronutrients were sprayed twice with the first at bloom (just after berry shelter) and second spray a week later at fruit setting. Water was sprayed to serve as a control. After the fruits were fully mature, five clusters were randomly harvested from each vine to determine the cluster and berry weight , number of berries per cluster, berry length and width, fruit weight and fruit extract was measured using hand refractometer. cluster and berry weight of sprayed vines increased significantly over the nonsprayed vines and the largest cluster weight depicted as fruit yield per vine (10.56 kg) was obtained in this treatment where all the micronutrients were applied combined. Maximum berry weight, width, length and TSS i.e. 2.86g, 1.91mm, 1.82mm and 19.22% respectively, were recorded in this Treatment. Statistical differences were recorded for cluster weight, berry weight, berry width, length and TSS with Zn, Mn, Fe treatments. Micronutrients spray on the flame seedless grape cultivar may be recommended for obtaining higher yield.
